From feda78e052edb862b0e666f8d3af68f00ed7c0df Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Tue, 14 Jan 2020 13:13:14 +0100
Subject: [PATCH] build: remove env.sh (#20541)

* build: remove env.sh

This removes the dirty symlink-to-self hack we've had for years. The
script was added to enable building without GOPATH and did that job
reliably for all this time. We can remove the workaround because modern
Go supports building without GOPATH natively.

* Makefile: add GO111MODULE=on to environment
---
 Makefile                     | 43 ++++++++++++++++++------------------
 build/ci.go                  | 14 ++----------
 build/deb/ethereum/deb.rules |  2 +-
 build/env.sh                 | 30 -------------------------
 internal/build/util.go       |  9 --------
 5 files changed, 25 insertions(+), 73 deletions(-)
 delete mode 100755 build/env.sh

diff --git a/Makefile b/Makefile
index 474fe61ed5..67095f4d00 100644
--- a/Makefile
+++ b/Makefile
@@ -10,33 +10,34 @@
 
 GOBIN = ./build/bin
 GO ?= latest
+GORUN = env GO111MODULE=on go run
 
 geth:
-	build/env.sh go run build/ci.go install ./cmd/geth
+	$(GORUN) build/ci.go install ./cmd/geth
 	@echo "Done building."
 	@echo "Run \"$(GOBIN)/geth\" to launch geth."
 
 all:
-	build/env.sh go run build/ci.go install
+	$(GORUN) build/ci.go install
 
 android:
-	build/env.sh go run build/ci.go aar --local
+	$(GORUN) build/ci.go aar --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/geth.aar\" to use the library."
 
 ios:
-	build/env.sh go run build/ci.go xcode --local
+	$(GORUN) build/ci.go xcode --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/Geth.framework\" to use the library."
 
 test: all
-	build/env.sh go run build/ci.go test
+	$(GORUN) build/ci.go test
 
 lint: ## Run linters.
-	build/env.sh go run build/ci.go lint
+	$(GORUN) build/ci.go lint
 
 clean:
-	go clean -cache
+	env GO111MODULE=on go clean -cache
 	rm -fr build/_workspace/pkg/ $(GOBIN)/*
 
 # The devtools target installs tools required for 'go generate'.
@@ -63,12 +64,12 @@ geth-linux: geth-linux-386 geth-linux-amd64 geth-linux-arm geth-linux-mips64 get
 	@ls -ld $(GOBIN)/geth-linux-*
 
 geth-linux-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
 	@echo "Linux 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep 386
 
 geth-linux-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
 	@echo "Linux amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep amd64
 
@@ -77,42 +78,42 @@ geth-linux-arm: geth-linux-arm-5 geth-linux-arm-6 geth-linux-arm-7 geth-linux-ar
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm
 
 geth-linux-arm-5:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
 	@echo "Linux ARMv5 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-5
 
 geth-linux-arm-6:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
 	@echo "Linux ARMv6 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-6
 
 geth-linux-arm-7:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
 	@echo "Linux ARMv7 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-7
 
 geth-linux-arm64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
 	@echo "Linux ARM64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm64
 
 geth-linux-mips:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips
 
 geth-linux-mipsle:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPSle cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mipsle
 
 geth-linux-mips64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64
 
 geth-linux-mips64le:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64le cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64le
 
@@ -121,12 +122,12 @@ geth-darwin: geth-darwin-386 geth-darwin-amd64
 	@ls -ld $(GOBIN)/geth-darwin-*
 
 geth-darwin-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
 	@echo "Darwin 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep 386
 
 geth-darwin-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
 	@echo "Darwin amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep amd64
 
@@ -135,11 +136,11 @@ geth-windows: geth-windows-386 geth-windows-amd64
 	@ls -ld $(GOBIN)/geth-windows-*
 
 geth-windows-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
 	@echo "Windows 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep 386
 
 geth-windows-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
 	@echo "Windows amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep amd64
diff --git a/build/ci.go b/build/ci.go
index 1ec8e01832..257c479e30 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -214,9 +214,9 @@ func doInstall(cmdline []string) {
 		var minor int
 		fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)
 
-		if minor < 9 {
+		if minor < 11 {
 			log.Println("You have Go version", runtime.Version())
-			log.Println("go-ethereum requires at least Go version 1.9 and cannot")
+			log.Println("go-ethereum requires at least Go version 1.11 and cannot")
 			log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
 			os.Exit(1)
 		}
@@ -237,13 +237,6 @@ func doInstall(cmdline []string) {
 		build.MustRun(goinstall)
 		return
 	}
-	// If we are cross compiling to ARMv5 ARMv6 or ARMv7, clean any previous builds
-	if *arch == "arm" {
-		os.RemoveAll(filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_arm"))
-		for _, path := range filepath.SplitList(build.GOPATH()) {
-			os.RemoveAll(filepath.Join(path, "pkg", runtime.GOOS+"_arm"))
-		}
-	}
 
 	// Seems we are cross compiling, work around forbidden GOBIN
 	goinstall := goToolArch(*arch, *cc, "install", buildFlags(env)...)
@@ -294,7 +287,6 @@ func goTool(subcmd string, args ...string) *exec.Cmd {
 
 func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd {
 	cmd := build.GoTool(subcmd, args...)
-	cmd.Env = []string{"GOPATH=" + build.GOPATH()}
 	if arch == "" || arch == runtime.GOARCH {
 		cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
 	} else {
@@ -888,7 +880,6 @@ func gomobileTool(subcmd string, args ...string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "gomobile"), subcmd)
 	cmd.Args = append(cmd.Args, args...)
 	cmd.Env = []string{
-		"GOPATH=" + build.GOPATH(),
 		"PATH=" + GOBIN + string(os.PathListSeparator) + os.Getenv("PATH"),
 	}
 	for _, e := range os.Environ() {
@@ -1078,7 +1069,6 @@ func xgoTool(args []string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
 	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, []string{
-		"GOPATH=" + build.GOPATH(),
 		"GOBIN=" + GOBIN,
 	}...)
 	return cmd
diff --git a/build/deb/ethereum/deb.rules b/build/deb/ethereum/deb.rules
index 983b87af16..760e1f0e25 100644
--- a/build/deb/ethereum/deb.rules
+++ b/build/deb/ethereum/deb.rules
@@ -22,7 +22,7 @@ override_dh_auto_build:
 	(mkdir -p build/_workspace/pkg/mod && mv .mod/* build/_workspace/pkg/mod)
 
 	# A fresh Go was built, all dependency downloads faked, hope build works now
-	build/env.sh ../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}
+	../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}
 
 override_dh_auto_test:
 
diff --git a/build/env.sh b/build/env.sh
deleted file mode 100755
index 3914555d1b..0000000000
--- a/build/env.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/sh
-
-set -e
-
-if [ ! -f "build/env.sh" ]; then
-    echo "$0 must be run from the root of the repository."
-    exit 2
-fi
-
-# Create fake Go workspace if it doesn't exist yet.
-workspace="$PWD/build/_workspace"
-root="$PWD"
-ethdir="$workspace/src/github.com/ethereum"
-if [ ! -L "$ethdir/go-ethereum" ]; then
-    mkdir -p "$ethdir"
-    cd "$ethdir"
-    ln -s ../../../../../. go-ethereum
-    cd "$root"
-fi
-
-# Set up the environment to use the workspace.
-GOPATH="$workspace"
-export GOPATH
-
-# Run the command inside the workspace.
-cd "$ethdir/go-ethereum"
-PWD="$ethdir/go-ethereum"
-
-# Launch the arguments with the configured environment.
-exec "$@"
diff --git a/internal/build/util.go b/internal/build/util.go
index 08a71d8777..fc559760b2 100644
--- a/internal/build/util.go
+++ b/internal/build/util.go
@@ -51,15 +51,6 @@ func MustRunCommand(cmd string, args ...string) {
 	MustRun(exec.Command(cmd, args...))
 }
 
-// GOPATH returns the value that the GOPATH environment
-// variable should be set to.
-func GOPATH() string {
-	if os.Getenv("GOPATH") == "" {
-		log.Fatal("GOPATH is not set")
-	}
-	return os.Getenv("GOPATH")
-}
-
 var warnedAboutGit bool
 
 // RunGit runs a git subcommand and returns its output.